Business Segment Information (Schedule Of Geographic Information Net Sales) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Net Sales	$ 207,005	$ 171,189	$ 161,178	$ 146,368	$ 159,505	$ 140,191	$ 138,930	$ 132,833	$ 685,740	$ 571,459	$ 537,291
United States [Member]
Net Sales									503,100	403,600	385,500
Asia [Member]
Net Sales									69,800	68,100	70,400
Europe [Member]
Net Sales									75,400	71,600	46,600
Canada [Member]
Net Sales									22,200	12,900	11,600
India [Member]
Net Sales									4,800	2,900	4,300
Other [Member]
Net Sales									$ 10,400	$ 12,400	$ 18,900